/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with this
 * work for additional information regarding copyright ownership. The ASF
 * licenses this file to You under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.apache.commons.exec;

/**
 * Destroys all registered {@link java.lang.Process} after a certain event,
 * typically when the VM exits
 * 
 * @see org.apache.commons.exec.ShutdownHookProcessDestroyer
 */
public interface ProcessDestroyer {

	/**
	 * Returns <code>true</code> if the specified {@link java.lang.Process} was
	 * successfully added to the list of processes to be destroy.
	 * 
	 * @param process
	 *            the process to add
	 * @return <code>true</code> if the specified {@link java.lang.Process} was
	 *         successfully added
	 */
	boolean add(Process process);

	/**
	 * Returns <code>true</code> if the specified {@link java.lang.Process} was
	 * successfully removed from the list of processes to be destroy.
	 * 
	 * @param process
	 *            the process to remove
	 * @return <code>true</code> if the specified {@link java.lang.Process} was
	 *         successfully removed
	 */
	boolean remove(Process process);

	/**
	 * Returns the number of registered processes.
	 * 
	 * @return the number of register process
	 */
	int size();
}
